EP3989628A1 - Endgerät - Google Patents

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Publication number
EP3989628A1
EP3989628A1 EP19934144.7A EP19934144A EP3989628A1 EP 3989628 A1 EP3989628 A1 EP 3989628A1 EP 19934144 A EP19934144 A EP 19934144A EP 3989628 A1 EP3989628 A1 EP 3989628A1
Authority
EP
European Patent Office
Prior art keywords
terminal
beam failure
scell
bfr
base station
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP19934144.7A
Other languages
English (en)
French (fr)
Inventor
Tooru Uchino
Yuki Matsumura
Hideaki Takahashi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NTT Docomo Inc
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NTT Docomo Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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Publication of EP3989628A1 publication Critical patent/EP3989628A1/de
Withdrawn legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0686—Hybrid systems, i.e. switching and simultaneous transmission
    • H04B7/0695—Hybrid systems, i.e. switching and simultaneous transmission using beam selection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H04B7/0868—Hybrid systems, i.e. switching and combining
    • H04B7/088—Hybrid systems, i.e. switching and combining using beam selection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/04—Arrangements for maintaining operational condition
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/19—Connection re-establishment

Definitions

  • the present invention relates to a terminal that performs a beam failure recovery.
  • LTE Long Term Evolution
  • LTE-Advanced LTE-Advanced
  • 5G New Radio
  • a large number of terminals can communicate simultaneously by directing different beams to respective terminals using beam forming.
  • Release 15 specifies a beam failure recovery (BFR) procedure to be performed by a terminal when the terminal detects a beam failure in a primary cell (PCell).
  • BFR beam failure recovery
  • the terminal when a terminal detects a beam failure, the terminal transmits a beam failure recovery request to a network, specifically, a radio base station.
  • Non Patent Document 1 "LS on MAC CE design for SCell BFR”, R1-1907870, 3GPP TSG RAN WG1 Meeting #97, 3GPP, May, 2019.
  • the number of SCells is larger than the number of SpCells. For this reason, in each Scell, when each terminal performs the BFR procedure, the beam failure recovery request is transmitted, which may increase a load on the network.
  • an object of the present invention is to provide a terminal, which simultaneously configures a primary cell and a secondary cell, capable of recovering a beam failure in the secondary cell while suppressing an increase in a load on a network.
  • a terminal (200) that simultaneously configures a primary cell (PCell) and a secondary cell (SCell), and including a receiving unit (220) that receives a reference signal for use in a detection of a beam failure in the secondary cell (SCell), and a controller (270) that performs at least one of the detection of the beam failure and a beam failure recovery request based on a reception quality of the reference signal, in which the controller (270) performs at least one of the detection of the beam failure and the beam failure recovery request when a predetermined condition is satisfied.
  • a receiving unit (220) that receives a reference signal for use in a detection of a beam failure in the secondary cell (SCell)
  • a controller (270) that performs at least one of the detection of the beam failure and a beam failure recovery request based on a reception quality of the reference signal, in which the controller (270) performs at least one of the detection of the beam failure and the beam failure recovery request when a predetermined condition is satisfied.
  • a terminal (200) that simultaneously configures a primary cell (PCell) and a secondary cell (SCell), and including a receiving unit (220) that receives a reference signal for use in a detection of a beam failure in the secondary cell (SCell), and a controller (270) that performs at least one of the detection of the beam failure and a beam failure recovery request based on a reception quality of the reference signal, in which the controller (270) extends a time from the detection of the beam failure to the performance of the beam failure recovery request when a predetermined condition is not satisfied.
  • Fig. 1 is an overall schematic configuration diagram of a radio communication system 10 according to the embodiment.
  • the radio communication system 10 is a radio communication system according to 5G (NR).
  • the radio communication system 10 includes radio base stations 100, 110 and a terminal 200.
  • the terminal 200 is also referred to as a user equipment (UE) or media access control (MAC) entity.
  • UE user equipment
  • MAC media access control
  • a specific configuration of the radio communication system 10 including the number of radio base stations and terminals is not limited to the example illustrated in Fig. 1 .
  • Each of the radio base stations 100, 110 is a gNB or an eg-eNB, and is included in a Next Generation-Radio Access Network (NG-RAN, not illustrated).
  • the NR-RAN is connected to a core network (5GC, not illustrated) according to the NR. Note that the NG-RAN and the 5GC may be simply expressed as a "network”.
  • the radio base stations 100, 110 perform radio communication according to the NR between the radio base stations 100, 110 and the terminal 200.
  • the radio base stations 100, 110 and the terminal 200 can support Massive MIMO in which a more highly directional beam is generated, carrier aggregation (CA) in which a plurality of component carriers (CCs) are used, dual connectivity (DC) for simultaneously transmitting CCs between a plurality of NG-RAN Nodes and a terminal, and the like, by controlling a radio signal transmitted from a plurality of antenna elements.
  • CA carrier aggregation
  • DC dual connectivity
  • a serving cell is classified as follows. Note that the serving cell is a cell in which a radio link is established between the terminal and the cell.
  • MCG includes a primary cell (hereinafter, referred to as PCell) and one or more secondary cells (hereinafter, referred to as SCell).
  • PCell primary cell
  • SCell secondary cells
  • the PCell is a cell used so that a terminal starts an initial connection with the MN.
  • the SCG includes a primary SCell (hereinafter, referred to as PSCell) and one or more SCells.
  • PSCell is a cell used so that a terminal starts an initial connection with the SN.
  • the PCell is also referred to as a special cell (SpCell) in the MCG.
  • PSCell is also referred to as the SpCell in the SCG.
  • a physical uplink control channel (PUCCH) is configured in the PCell and one SCell.
  • the terminal transmits uplink control information (UCI) of each CC to the radio base station using the PCell or the SCell (PUCCH-SCell) in which the PUCCH is configured.
  • UCI uplink control information
  • the radio base station 100 forms the PCell.
  • the radio base station 110 forms the SCell.
  • the SCell formed by the radio base station 110 is within a coverage area of the PCell formed by the radio base station 100.
  • the PCell may be formed by the radio base station 110.
  • the SCell may be formed by the radio base station 100.
  • the terminal 200 configures the PCell and the SCell simultaneously.
  • the radio base station 110 includes a multi-element antenna and can form beam forming using a plurality of beams.
  • the terminal 200 can transmit and receive a radio signal between the radio base station 110 and the terminal 200 by establishing a beam pair between the radio base station 110 and the terminal 200.
  • Fig. 2 is a diagram for explaining a beam failure recovery (hereinafter, referred to as BFR) procedure in the SCell. As illustrated in Fig. 2 , in the BFR procedure, when detecting a beam failure in the SCell, the terminal 200 performs a BFR request to be described later.
  • BFR beam failure recovery
  • Fig. 3 is a diagram for explaining a transmission of a reference signal using the beam forming by the radio base station 110.
  • the radio base station 110 transmits reference signals RS1 to RS7 for detecting a beam failure for each beam within the SCell.
  • the reference signal RS2 for detecting a beam failure is a reference signal transmitted by terminal 200 using a beam in which a beam pair is currently established.
  • the reference signals RS1 to RS7 for detecting a beam failure are, for example, a channel quality information reference signal (CSI-RS) or a synchronization signal block (SSB).
  • CSI-RS channel quality information reference signal
  • SSB synchronization signal block
  • the terminal 200 receives the reference signals RS1 to RS7 for detecting a beam failure, and measures reception qualities (for example, layer 1-reference signal reception power (L1-RSRP)) of the reference signals RS1 to RS7 for detecting a beam failure.
  • the terminal 200 detects a beam failure based on a measurement result.
  • the terminal 200 detects the occurrence of the beam failure.
  • the terminal 200 may detect the occurrence of the beam failure.
  • the terminal 200 receives a reference signal for determining a candidate of a new beam transmitted from the radio base station 110 for each beam.
  • the terminal 200 measures reception quality (for example, L1-RSRP) of the reference signal for determining a candidate of a new beam.
  • the terminal 200 determines a candidate of a new beam based on a measurement result.
  • the terminal 200 determines, as a candidate of a new beam, a beam associated with a reference signal for determining a candidate of a new beam having the highest reception quality.
  • the terminal 200 may determine, as a candidate of a new beam, a predetermined number of beams associated with a predetermined number of reference signals for determining a candidate of a new beam in decreasing order of reception quality, starting with the reference signal having the highest reception quality.
  • the terminal 200 may determine a candidate of a new beam using reception qualities of the reference signals RS1 to RS7 for detecting a beam failure.
  • the terminal 200 sets a threshold for determining a candidate of a new beam and all of reception qualities of the reference signals for determining a candidate of a new beam are equal to or less than the threshold for determining a candidate of a new beam, it may be considered that there is no candidate of a new beam.
  • the terminal 200 When the terminal 200 detects a beam failure and determines a candidate of a new beam, the terminal 200 transmits a BFR request to the radio base station 100 using the PCell.
  • Fig. 4 is a diagram for explaining a transmission of a BFR request.
  • the terminal 200 requests a BFR in two steps.
  • step 1 the terminal 200 notifies an occurrence of a beam failure using a dedicated SR-like PUCCH (S1).
  • the dedicated SR-like PUCCH is a message having the same function as the conventional scheduling request.
  • step 2 the terminal 200 reports information on an SCell in which the beam failure has occurred and a candidate of a new beam using a MAC control element (MAC CE) (S3).
  • MAC CE MAC control element
  • the terminal 200 may report that a candidate of a new beam is detected, instead of reporting a candidate of a new beam.
  • the terminal 200 may include, in one message, the occurrence of the beam failure, the information on the SCell in which the beam failure has occurred, and the candidate of the new beam, and notify the radio base station 100 of those included in the one message.
  • the terminal 200 may notify the occurrence of the beam failure using a message other than the dedicated SR-like PUCCH.
  • the terminal 200 may report the information on the SCell in which the beam failure has occurred or the candidate of the new beam using a message other than the MAC CE.
  • the terminal 200 may notify the radio base station 100 of the candidate of the new beam through a PUCCH-SR transmission.
  • the terminal 200 may notify the BFR request in the SCell using the PRACH in a manner similar to the BFR request in the PCell or the PSCell.
  • PRACH physical random access channel
  • the radio base station 100 When the radio base station 100 receives the BFR request from the terminal 200, the radio base station 100 switches the beam used for the beam pair having established between the terminal 200 and the radio base station 110 to a new beam included in the candidate of the new beam reported using the MAC CE, in the SCell in which the beam failure has occurred. Thereby, the radio base station 100 can establish a new beam pair between the terminal 200 and the radio base station 110 using the new beam to be switched.
  • the radio base station 100 changes a transmission configuration indicator state (TCI state) within a layer 1 (L1) signal such as a radio resource control (RRC) message, a MAC CE, or a physical downlink control channel (PDCCH), and notifies the terminal 200 of the switching to the new beam using the RRC message, the MAC CE, or an L1 signal.
  • TCI state is configured in the RRC message.
  • the terminal 200 reads the TCI state configuration in the RRC message to re-establish a beam (or beam pair) for communication between the radio base station 110 and the terminal 200, and transmission and reception of radio signals are preformed between the radio base station 110 and the terminal 200.
  • FR1 and FR2 are set.
  • the FR1 and FR2 are as follows.
  • each cell belongs to the FR1 or FR2.
  • the functional block configuration of the radio communication system 10 will be described. Specifically, the functional block configuration of the terminal 200 will be described. Hereinafter, only portions related to the features in the present embodiment will be described. Therefore, the terminal 200 includes other functional blocks that are not directly related to the features in the present embodiment.
  • Fig. 5 is a functional block configuration diagram of the terminal 200.
  • the terminal 200 includes a transmitting unit 210, a receiving unit 220, a beam configuration unit 230, an uplink information retaining unit 240, a priority information retaining unit 250, a group information retaining unit 260, and a controller 270.
  • the transmitting unit 210 transmits an uplink signal using an uplink configured in each of the PCell and the SCell. For example, the transmitting unit 210 transmits a BFR request via an uplink configured in the SCell, another uplink other than the uplink configured in the SCell, or an uplink in which an uplink channel having a short transmission interval is configured. The transmitting unit 210 transmits a BFR request in a plurality of SCells using the same message.
  • the receiving unit 220 transmits a downlink signal using a downlink configured in each of the PCell and the SCell. For example, the receiving unit 220 receives the reference signals RS1 to RS7 for detecting a beam failure and the reference signal for determining a candidate of a new beam in the SCell. The receiving unit 220 receives the RRC message including the TCI state having the configuration change to the new beam to be switched.
  • the beam configuration unit 230 establishes or reestablishes a beam pair between the radio base station 110 and the terminal 200 with reference to the TCI state included in the RRC message received by the receiving unit 220.
  • the uplink information retaining unit 240 retains uplink information used for the transmitting unit 210 to transmit the BFR request.
  • the priority information retaining unit 250 retains a priority of the SCell existing in the radio communication system 10, a priority of the MAC CE to be transmitted and received in the radio communication system 10, a priority of the BFR procedure to be performed in the radio communication system 10, and a priority of a plurality of groups within a control unit that is a target of the BFR procedure.
  • the group information retaining unit 260 retains group information within each control unit that is a target of the BFR procedure.
  • the controller 270 performs a detection of the beam failure, a BFR request, a BFR complete determination, and a BFR failure determination, which will be described later.
  • the controller 270 performs the BFR procedure, specifically, at least one of the detection of the beam failure and the transmission of the BFR request.
  • the controller 270 performs only the detection of the beam failure when a predetermined condition is satisfied.
  • the controller 270 stops at least one of the detection of the beam failure and the transmission of the BFR request.
  • the controller 270 extends a time from the detection of the beam failure to the performance of the beam failure recovery request when a predetermined condition is not satisfied.
  • the controller 270 determines the uplink used for the transmitting unit 210 to transmit the BFR request.
  • the controller 270 determines that the BFR procedure is completed when the transmitting unit 210 transmits the BFR request.
  • the controller 270 determines that the BFR procedure is completed when the receiving unit 220 receives the configuration change to the new beam to be switched and the new beam to be switched is included in the candidate of the new beam.
  • the controller 270 notifies a predetermined value as the quality information of the SCell until the BFR procedure is completed.
  • the controller 270 determines that the BFR procedure is completed when the receiving unit 220 does not receive a response to the BFR request before a predetermined period has elapsed after the transmitting unit 210 transmits the BFR request.
  • the controller 270 stops the transmission of the BFR request.
  • the controller 270 performs the BFR procedure in a predetermined cell in a predetermined group.
  • the controller 270 performs the BFR procedure in the SCell.
  • the controller 270 performs the detection of the beam failure, and when the BFR procedure is permitted for a second group (for example, one group in a cell group unit) to which the SCell belongs, the controller 270 performs the BFR request.
  • an operation of a radio communication system 1 in the BFR procedure will be described. Specifically, (1) an operation of the terminal 200 when detecting the beam failure, (2) an operation of the terminal 200 when performing the BFR request, (3) an operation of the terminal 200 when determining the BFR completion, (4) an operation of the terminal 200 when the BFR procedure fails, and (5) an operation of the terminal 200 when simultaneously performing the detection of the beam failure in a plurality of SCells will be described.
  • the terminal 200 detects the occurrence of the beam failure.
  • the threshold can be set on a cell basis, but is not limited thereto, and may be set in a terminal unit, a cell group unit (which may be a cell group for DC, a cell group for a PUCCH group, and a cell group in which cells (alternatively, CCs) are grouped in general), a MAC entity unit, and an FR unit.
  • the terminal 200 determines whether to perform the BFR procedure based on a state of the terminal 200 or the MAC entity.
  • Fig. 6 is a diagram illustrating an operation flow of the terminal 200 according to the operation example 1 when the beam failure is detected.
  • the terminal 200 detects a state of the terminal 200 or the MAC entity (S11).
  • the terminal 200 determines whether the detected state of the terminal 200 or the MAC entity satisfies a predetermined condition (S13).
  • Examples of the predetermined condition include a case where the terminal 200 is in an active time in a discontinuous reception state (DRX state), a case where the terminal 200 is not in a state (PDCCH skipping state) where at least a part of PDCCH decoding is not performed, and the like.
  • DRX state discontinuous reception state
  • PDCCH skipping state a state where at least a part of PDCCH decoding is not performed
  • the predetermined condition specifically, when the terminal 200 is in an inactive time in the DRX state, or when the terminal 200 is in the PDCCH skipping state, a part of transmission and reception of the radio signal is not performed. Due to this, it is assumed that the amount of data transmitted and received is not large. For this reason, it is not necessary to perform the BFR procedure in the SCell at an early stage.
  • the terminal 200 When the predetermined condition is satisfied, the terminal 200 performs the BFR procedure (S15). Specifically, the controller 270 performs at least one of the detection of the beam failure and the transmission of the BFR request. The controller 270 may perform only the detection of the beam failure when the predetermined condition is satisfied.
  • the operation for the BFR procedure is determined (S17).
  • the terminal 200 stops the BFR procedure.
  • the terminal 200 stops the detection of the beam failure in the SCell.
  • the terminal 200 may also stop the BFR request when detecting the beam failure in the SCell, instead of stopping the detection of the beam failure in the SCell.
  • the terminal 200 may extend a time from the detection of the beam failure in the SCell to the performance of the BFR request longer than a normal set time (for example, several ms). In this case, the terminal 200 may be instructed by the radio base station 100 or the radio base station 110 as to whether to make the time longer than the normal set time.
  • a normal set time for example, several ms.
  • the instruction can be set on a cell basis, but is not limited thereto, and may be set in a terminal unit, a cell group unit (which may be a cell group for DC, a cell group for a PUCCH group, and a cell group in which cells (alternatively, CCs) are grouped in general), a MAC entity unit, a bandwidth part (BWP) unit (which may be generalized as a resource unit in a frequency domain), a channel unit, and a state unit.
  • a cell group unit which may be a cell group for DC, a cell group for a PUCCH group, and a cell group in which cells (alternatively, CCs) are grouped in general
  • a MAC entity unit which may be a cell group for DC, a cell group for a PUCCH group, and a cell group in which cells (alternatively, CCs) are grouped in general
  • BWP bandwidth part
  • the terminal 200 determines whether to perform the BFR procedure based on the state of the SCell.
  • Fig. 7 is a diagram illustrating an operation flow of the terminal 200 according to the operation example 2 when the beam failure is detected.
  • the terminal 200 detects the state of the SCell (S21).
  • the terminal 200 determines whether the detected state of the SCell satisfies a predetermined condition (S23) .
  • Examples of the predetermined condition include a case where the SCell is in an activated state (SCell activated state), a case where the SCell is in a state where PDCCH monitoring, reception processing, and decoding processing are performed, and the like.
  • the predetermined condition when the SCell is in a deactivated state (SCell deactivated state), when the SCell is in the state (SCell dormant state) where at least the PDCCH monitoring, the reception processing, and the decoding processing are not performed (it is permissible not to implement, or a requirement to be satisfied at the time of implementation is relieved), it is assumed that the amount of data to be transmitted and received is not much because a part of the transmission and reception of the radio signal is not performed. For this reason, it is not necessary to perform the BFR procedure in the SCell at an early stage. This makes it possible to obtain a battery saving effect.
  • SCell dormant state may be a newly defined above-described state, or may be a state transitioned (activated) to a BWP where some channels such as PDCCH are not configured.
  • the terminal 200 When the predetermined condition is satisfied, the terminal 200 performs the BFR procedure similar to S15 of Fig. 6 . On the other hand, when the predetermined condition is not satisfied, the terminal 200 determines the operation for the BFR procedure in a manner similar to S17 of Fig. 6 (S27).
  • the terminal 200 may stop uplink transmission in the SCell.
  • the terminal 200 may change the stop of the uplink transmission based on a predetermined frame configuration or a duplex mode (for example, time division duplex (TDD)).
  • a duplex mode for example, time division duplex (TDD)
  • the terminal 200 may consider that a time alignment (TA) timer associated with the uplink transmission has expired.
  • the terminal 200 may perform a MAC reset when stopping the uplink transmission.
  • TA time alignment
  • the terminal 200 may change the BWP configured in the SCell to a BWP that cannot perform the uplink transmission in order to stop the uplink transmission in the SCell.
  • the terminal 200 uses the dedicated SR-like PUCCh in the BFR request to notify the occurrence of the beam failure, thereby performing a scheduling request and then reporting the information on the SCell in which the beam failure occurs and the candidate of the new beam using the MAC CE.
  • the terminal 200 may use the MAC CE to report the information on the SCell in which the beam failure occurs and the candidate of the new beam, and then use the transmission of the MAC CE as a trigger to perform a scheduling request to the radio base station 100 using PRACH or PUCCH-SR at a MAC layer.
  • the terminal 200 may use a transmission of a normal buffer status report (BSR) as a trigger to perform the scheduling request to the radio base station 100.
  • BSR buffer status report
  • Fig. 8 is a diagram illustrating an operation flow of the terminal 200 when the BFR request is performed.
  • the terminal 200 detects the beam failure in the SCell (S31).
  • the terminal 200 determines a candidate of a new beam (S33).
  • the terminal 200 determines an uplink used to transmit the MAC CE in order to perform the BFR request (S35).
  • the terminal 200 selects the following uplinks as an uplink used to transmit the MAC CE in order to reliably transmit the MAC CE.
  • An uplink other than the uplink (for example, the uplink configured by a UL grant in the SCell) configured in the SCell in which the beam failure is detected.
  • the terminal 200 may select the following uplinks as an uplink to be used to transmit the MAC CE in order to transmit the MAC CE at an early stage.
  • An uplink for example, an uplink with a short PUSCH duration in a logical channel (LCH) restriction
  • LCH logical channel
  • the terminal 200 determines the uplink to be used to transmit the MAC CE
  • the terminal 200 performs the BFR request by transmitting the MAC CE using the determined uplink (S37).
  • the terminal 200 can preferentially transmit the MAC CE to be used to perform the BFR request than a predetermined MAC CE, regarding a priority between the MAC CE to be used to perform the BFR request and other MAC CEs.
  • the MAC CE to be used to perform the BFR request can be preferentially transmitted than a BSR or a power headroom (PHR).
  • PHR power headroom
  • the terminal 200 may include the BSR or the PHR in the MAC CE, for example.
  • Fig. 9 is a diagram illustrating an operation flow of the terminal 200 when the BFR request is performed. As illustrated in Fig. 9 , the terminal 200 performs the BFR request in the SCell (S41). When the terminal 200 performs the BFR request, the terminal 200 determines whether a success condition is satisfied (S43).
  • the terminal 200 determines that the success condition is satisfied when the MAC CE is transmitted using the uplink in the BFR request. Note that the terminal 200 may determine that the success condition is satisfied when a predetermined period elapses after transmitting the MAC CE.
  • the terminal 200 can determine that the success condition is satisfied when a new transmission is triggered in Hybrid-ARQ (HARQ) processing or process activated by the transmission of the MAC CE. Note that when receiving an acknowledgment (ACK) for the transmission of the MAC CE, the terminal 200 may determine that the success condition is satisfied.
  • HARQ Hybrid-ARQ
  • the terminal 200 may determine that a success report is satisfied when the TCI state within the RRC message received from the radio base station 100 is changed.
  • the terminal 200 may determine that the success condition is satisfied when the RRC message is received via a physical downlink control channel (PDCCH) with a predetermined control resource set (CORSET).
  • the PDCCH may be configured in the SpCell or SCell.
  • the terminal 200 may determine that the success condition is satisfied when it is detected that a physical downlink shared channel (PDSCH) including the MAC CE to be used to transmit a candidate of a new beam is scheduled, the PDSCH is detected, the PDSCH is received, a decoding result (CRC) is OK, the MAC CE is included, and the like, with a predetermined CORSET.
  • PDSCH physical downlink shared channel
  • CRC decoding result
  • the terminal 200 may determine that the success condition is satisfied.
  • the terminal 200 determines that the BFR procedure succeeds, and the BFR procedure is completed (S45).
  • the terminal 200 determines that the BFR procedure fails, and the BFR procedure is completed (S47). In this case, the terminal 200 may report the result to the radio base station 100. For example, SCell failure information, SCG failure information, or a measurement report may be transmitted. The terminal 200 may notify a value outside a set range as a channel quality indicator (CQI). The terminal 200 may notify the radio base station 100 that the monitoring of a candidate of a new beam and the report of a candidate of a new beam are stopped.
  • CQI channel quality indicator
  • the terminal 200 may determine whether a failure condition is satisfied in S43. For example, the terminal 200 determines that the failure condition is satisfied when notifying the radio base station 100 that there is no candidate of a new beam using the MAC CE in the BFR request. In this case, since the terminal 200 transmits the MAC CE, it may determine that the success condition is satisfied. Note that the terminal 200 may notify the radio base station 100 of the MAC CE that does not include a candidate of a new beam.
  • the radio base station 100 may deactivate the SCel. Also, the radio base station 100 may change the SCell to the SCell dormant state.
  • the terminal 200 may determine that the failure condition is satisfied.
  • the MAC CE may include or may not include a candidate of a new beam.
  • the terminal 200 determines that the BFR procedure fails, and the BFR procedure is completed. On the other hand, when determining that the failure condition is not satisfied, the terminal 200 determines that the BFR procedure succeeds, and the BFR procedure is completed.
  • the terminal 200 notifies a predetermined value as a CSI report of the SCell until the BFR procedure is completed. For example, the terminal 200 notifies a value outside a set range as the predetermined value. In addition, the terminal 200 notifies a value less than or equal to a predetermined value as a CQI until the BFR procedure is completed.
  • Fig. 10 is a diagram illustrating the operation flow of the terminal 200 when the BFR procedure fails.
  • the terminal 200 determines that the BFR procedure fails (S51). Subsequently, the terminal 200 determines whether to continue a detection of a candidate of a new beam (S53). When the detection of the candidate of the new beam is continued, the terminal 200 detects the candidate of the new beam (S55). Subsequently, the terminal 200 determines whether to continue the BFR request (S57).
  • the terminal 200 determines whether to continue the BFR request (S57). When continuing the BFR request, the terminal 200 continues the BFR request (S59). On the other hand, when the BFR request is not continued, the terminal 200 ends the BFR procedure.
  • the terminal 200 may determine to continue a detection of a candidate of a new beam in S53. In this case, the terminal 200 monitors a reference signal for detecting a candidate of a new beam again. Note that the terminal 200 may stop the monitoring when a predetermined period has elapsed. Thereby, the battery saving of the terminal 200 can be performed.
  • the terminal 200 may determine not to continue a detection of a candidate of a new beam in S53. In this case, the battery saving of the terminal 200 can be performed.
  • the terminal 200 may determine that a detection of a candidate of a new beam is continued in S53, and determine that the BFR request is continued in S57. In this case, the terminal 200 monitors a reference signal for detecting a candidate of a new beam again and performs the BFR request. Note that the terminal 200 may stop the monitoring when a predetermined period has elapsed. Thereby, the battery saving of the terminal 200 can be performed.
  • the terminal 200 may determine that a detection of a candidate of a new beam is not continued in S53, and determine that the BFR request is continued in S57. In this case, since the terminal 200 repeatedly performs the BFR request, the terminal 200 appropriately transmits a first detected candidate of a new beam to the radio base station 100.
  • the terminal 200 may determine that a detection of a candidate of a new beam is not continued in S53, and determine that the BFR request is not continued in S57. In this case, the battery saving of the terminal 200 can be performed.
  • the terminal 200 may resume a detection of a candidate of a new beam by using a start of another BFR procedure for another CC as a trigger.
  • the radio base station 100 can be notified by including a detected candidate of a new beam in a report in another BFR procedure.
  • terminal 200 when the detection of the beam failure is simultaneously performed in a plurality of SCells will be described.
  • the plurality of SCells is grouped for each control unit that is a target in which the BFR procedure is to be performed. That is, each of the plurality of SCells is associated with a control unit that is a target in which the BFR procedure is to be performed.
  • the control unit include a cell unit, a terminal unit, a cell group unit (which may be a cell group for DC, a cell group for a PUCCH group, and a cell group in which cells (alternatively, CCs) are grouped in general), a MAC entity unit, an FR unit, and the like.
  • the BFR procedure can be performed only on a predetermined number of cells at the same time. Between control units, cells in the control units can execute the BFR procedure in parallel.
  • the BFR procedure may be executed in all cells (or SCells) for which the execution of the BFR procedure is configured (or permitted).
  • the BFR procedure may be performed only for a predetermined number (for example, one) of SCells in each cell group in which the execution of the BFR procedure is permitted.
  • the BFR procedure can be performed for only one SCell within one cell group.
  • the predetermined cell may be designated by an RRC message, a MAC signal, or an L1 signal from NW, or a predetermined condition (for example, a cell having a predetermined index (ServcellIndex, ScellIndex, BWP-id, or the like), a maximum index, or a minimum index) may be selected.
  • mapping between each SCell and a cell group may be specified from the radio base station 100 using, for example, Quasi Co Location (QCL) or TCI state.
  • QCL Quasi Co Location
  • each SCell may be mapped to a predetermined cell group.
  • each SCell is mapped to the same cell group as the SpCell, a cell group having a predetermined cell group index (maximum, minimum), a first configured cell group, or the like.
  • a priority for performing the BFR procedure may be determined. For example, in the case of the operation in the cell group unit, a high priority is assigned to the SpCell, an SCell in which the PUCCH is configured, an SCell activated earlier in time, or a group including a predetermined SCell. Also, a priority for performing the BFR procedure may be specified by the radio base station 100. Note that a low-priority BFR procedure may be stopped or suspended.
  • control unit may be different for each process of the BFR procedure.
  • the processing in the BFR procedure includes, for example, the detection of the beam failure, the BFR request, the completion determination of the BFR procedure, and the failure determination of the BFR procedure described above.
  • the BFR request is performed in any of a plurality of SCells even if the detection of the beam failure is performed in the plurality of SCells.
  • the BFR request in the same cell group may be considered to be completed.
  • the BFR request in the same cell group may be considered to be completed.
  • Fig. 11 is a diagram illustrating the operation flow of the terminal 200 according to operation example 1 when the detection of the beam failure is performed simultaneously in a plurality of SCells. As illustrated in Fig. 11 , the terminal 200 determines whether the BFR procedure is permitted for a group to which an SCell in which the terminal 200 resides belongs (S61).
  • the terminal 200 When the BFR procedure is permitted, the terminal 200 performs the BFR procedure. On the other hand, when the BFR procedure is not permitted, the terminal 200 waits until the BFR procedure is permitted for the group to which the SCell belongs.
  • Fig. 12 is a diagram illustrating the operation flow of the terminal 200 according to operation example 2 when the detection of the beam failure is performed simultaneously in a plurality of SCells.
  • the terminal 200 determines whether the BFR procedure is permitted for a first group (for example, one group in a cell unit) to which an SCell in which the terminal 200 resides belongs (S71) .
  • the terminal 200 When the BFR procedure is permitted, the terminal 200 performs the detection of the beam failure (S73). On the other hand, when the BFR procedure is not permitted, the terminal 200 waits until the BFR procedure is permitted for the first group.
  • the terminal 200 determines whether the BFR procedure is permitted for a second group (for example, one group within a cell group unit) to which the SCell in which the terminal 200 resides belongs (S75).
  • a second group for example, one group within a cell group unit
  • the terminal 200 When the BFR procedure is permitted, the terminal 200 performs the BFR request (S77). On the other hand, when the BFR procedure is not permitted, the terminal 200 waits until the BFR procedure is permitted for the second group.
  • Operation example 3 describes an operation example of the terminal 200 when the terminal 200 detects the beam failures in a plurality of SCells.
  • Fig. 13 is a diagram illustrating the operation flow of the terminal 200 according to operation example 3 when the detection of the beam failure is performed simultaneously in a plurality of SCells.
  • the terminal 200 detects the beam failures in the plurality of SCells (S81). Subsequently, the terminal 200 determines a candidate of a new beam in each of the plurality of SCells (S83) .
  • the terminal 200 When determining a candidate of a new beam in each SCell, the terminal 200 configures a message to be used to report candidates of new beams in the plurality of SCells to the radio base station 100 (S85).
  • the terminal 200 configures information on the candidates of the new beams in the plurality of SCells within the same MAC CE.
  • the terminal 200 may configure information on the candidates of the new beams in the plurality of SCells within the same MAC CE according to a predetermined priority.
  • the terminal 200 may store the candidates of the new beams detected earlier in time in the same MAC CE in order.
  • the terminal 200 may preferentially store a candidate of a new beam in a predetermined SCell in the same MAC CE.
  • the terminal 200 may preferentially store a candidate of a new beam in an SCell designated from the radio base station 100 in the same MAC CE.
  • the terminal 200 may store different MAC CEs each in which information on a candidate of a new beam in each SCell is configured, in the same MAC packet data unit (PDU).
  • PDU MAC packet data unit
  • the terminal 200 performs the BFR request using the same message (S87). Specifically, the terminal 200 reports the candidates of the new beams in the plurality of SCells to the radio base station 100 using the same MAC CE or MAC PDU.
  • the terminal 200 performs at least one of the detection of the beam failure and the BFR request when the predetermined condition is satisfied.
  • the terminal 200 can perform the BFR procedure while suppressing the increase in the load on the network.
  • the terminal 200 performs only the detection of the beam failure when the predetermined condition is satisfied.
  • the Scell when the Scell is in the activated state or the terminal 200 is in the active time in the discontinuous reception state, at least one of the detection of the beam failure and the BFR request is performed.
  • the terminal 200 stops at least one of the detection of the beam failure and the BFR request when the predetermined condition is not satisfied.
  • the terminal 200 extends a time from the detection of the beam failure to the performance of the BFR request when the predetermined condition is not satisfied.
  • the terminal 200 can perform the BFR procedure while suppressing the increase in the load on the network.
  • the block diagram ( Fig. 5 ) used for explaining the above-described embodiment illustrates blocks of functional unit.
  • Those functional blocks are realized by a desired combination of at least one of hardware and software.
  • a method for realizing each functional block is not particularly limited. That is, each functional block may be realized by one device combined physically or logically. Alternatively, two or more devices separated physically or logically may be directly or indirectly connected (for example, wired, or wireless) to each other, and each functional block may be realized by these plural devices.
  • the functional blocks may be realized by combining software with the one device or the plural devices mentioned above.
  • Functions include judging, deciding, determining, calculating, computing, processing, deriving, investigating, searching, confirming, receiving, transmitting, outputting, accessing, resolving, selecting, choosing, establishing, comparing, assuming, expecting, considering, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating (mapping), assigning, and the like.
  • the functions are not limited thereto.
  • a functional block (structural component) that causes transmitting is referred to as a transmitting unit or a transmitter.
  • the realization method is not particularly limited to any one method.
  • Fig. 14 is a diagram illustrating an example of a hardware configuration of the terminal.
  • the terminal can be configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and the like
  • the term "device” can be replaced with a circuit, device, unit, and the like.
  • a hardware configuration of the device may be constituted by including one or plurality of the devices illustrated in the figure, or may be constituted without including some of the devices.
  • the functional blocks of the device are realized by any of hardware elements of the computer device or a combination of the hardware elements.
  • the processor 1001 performs operation by loading a predetermined software (program) on hardware such as the processor 1001 and the memory 1002, and realizes various functions of the device by controlling communication via the communication device 1004, and controlling at least one of reading and writing of data on the memory 1002 and the storage 1003.
  • a predetermined software program
  • the processor 1001 for example, operates an operating system to control the entire computer.
  • the processor 1001 can be configured with a central processing unit (CPU) including an interface with a peripheral device, a control device, an operation device, a register, and the like.
  • CPU central processing unit
  • the processor 1001 reads a program (program code), a software module, data, and the like from at least one of the storage 1003 and the communication device 1004 into the memory 1002, and executes various processing according to them.
  • a program program code
  • a software module software module
  • data data
  • the like data
  • various processing according to them are used.
  • various processing explained above may be executed by one processor 1001 or may be executed simultaneously or sequentially by two or more processors 1001.
  • the processor 1001 may be implemented by using one or more chips.
  • the program may be transmitted from a network via a telecommunication line.
  • the memory 1002 is a computer readable recording medium and may be configured, for example, with at least one of Read Only Memory (ROM), Erasable Programmable ROM (EPROM), Electrically Erasable Programmable ROM (EEPROM), Random Access Memory (RAM), and the like.
  • ROM Read Only Memory
  • EPROM Erasable Programmable ROM
  • EEPROM Electrically Erasable Programmable ROM
  • RAM Random Access Memory
  • the memory 1002 can be referred to as register, cache, main memory (main storage device), and the like.
  • the memory 1002 can store therein a program (program codes), software modules, and the like that can execute the method according to the embodiment of the present disclosure.
  • the storage 1003 is a computer readable recording medium.
  • Examples of the storage 1003 include at least one of an optical disk such as Compact Disc ROM (CD-ROM), a hard disk drive, a flexible disk, a magneto-optical disk (for example, a compact disk, a digital versatile disk, Blu-ray (Registered Trademark) disk), a smart card, a flash memory (for example, a card, a stick, a key drive), a floppy (Registered Trademark) disk, a magnetic strip, and the like.
  • the storage 1003 may be referred to as an auxiliary storage device.
  • the recording medium can be, for example, a database including at least one of the memory 1002 and the storage 1003, a server, or other appropriate media.
  • the communication device 1004 is hardware (transmission and reception device) capable of performing communication between computers via at least one of a wired network and a wireless network.
  • the communication device 1004 is also referred to as, for example, a network device, a network controller, a network card, a communication module, and the like.
  • the communication device 1004 may include a highfrequency switch, a duplexer, a filter, a frequency synthesizer, and the like in order to realize, for example, at least one of Frequency Division Duplex (FDD) and Time Division Duplex (TDD).
  • FDD Frequency Division Duplex
  • TDD Time Division Duplex
  • the input device 1005 is an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, and the like) that accepts input from the outside.
  • the output device 1006 is an output device (for example, a display, a speaker, an LED lamp, and the like) that outputs data to the outside. Note that, the input device 1005 and the output device 1006 may be integrated (for example, a touch screen).
  • the respective devices such as the processor 1001 and the memory 1002, are connected to each other with the bus 1007 for communicating information therebetween.
  • the bus 1007 may be constituted by a single bus or may be constituted by separate buses between the devices.
  • the device may be configured to include hardware such as a microprocessor, Digital Signal Processor (DSP), Application Specific Integrated Circuit (ASIC), Programmable Logic Device (PLD), and Field Programmable Gate Array (FPGA). Some or all of these functional blocks may be realized by the hardware.
  • the processor 1001 may be implemented by using at least one of these hardware.
  • Notification of information is not limited to that explained in the above aspect/embodiment, and may be performed by using a different method.
  • the notification of information may be performed by physical layer signaling (for example, Downlink Control Information (DCI), Uplink Control Information (UCI), higher layer signaling (for example, RRC signaling, Medium Access Control (MAC) signaling, broadcast information (Master Information Block (MIB), and System Information Block (SIB)), other signals, or a combination of these.
  • the RRC signaling may be referred to as RRC message, for example, or may be RRC Connection Setup message, RRC Connection Reconfiguration message, or the like.
  • LTE Long Term Evolution
  • LTE-A LTE-Advanced
  • SUPER 3G IMT-Advanced
  • 4G 4th generation mobile communication system
  • 5G 5th generation mobile communication system
  • Future Radio Access (FRA) New Radio (NR)
  • W-CDMA Registered Trademark
  • GSM Global System for Mobile Communications
  • UMB Ultra Mobile Broadband
  • IEEE 802.11 Wi-Fi (Registered Trademark)
  • IEEE 802.16 WiMAX (Registered Trademark)
  • IEEE 802.20 Ultra-WideBand (UWB), Bluetooth (Registered Trademark)
  • a plurality of systems may be combined (for example, a combination of at least one of the LTE and the LTE-A with the 5G).
  • the specific operation that is performed by the base station in the present disclosure may be performed by its upper node in some cases.
  • the various operations performed for communication with the terminal may be performed by at least one of the base station and other network nodes other than the base station (for example, MME, S-GW, and the like may be considered, but not limited thereto).
  • MME Mobility Management Entity
  • S-GW Serving Mobility Management Entity
  • an example in which there is one network node other than the base station is explained; however, a combination of a plurality of other network nodes (for example, MME and S-GW) may be used.
  • Information and signals can be output from a higher layer (or lower layer) to a lower layer (or higher layer). It may be input and output via a plurality of network nodes.
  • the input and output information can be stored in a specific location (for example, a memory) or may be managed in a management table.
  • the information to be input and output can be overwritten, updated, or added.
  • the information may be deleted after outputting.
  • the inputted information may be transmitted to another device.
  • the determination may be made by a value (0 or 1) represented by one bit or by Boolean value (Boolean: true or false), or by comparison of numerical values (for example, comparison with a predetermined value).
  • notification of predetermined information is not limited to being performed explicitly, and it may be performed implicitly (for example, without notifying the predetermined information).
  • software should be interpreted broadly to mean instruction, instruction set, code, code segment, program code, program, subprogram, software module, application, software application, software package, routine, subroutine, object, executable file, execution thread, procedure, function, and the like.
  • software, instruction, information, and the like may be transmitted and received via a transmission medium.
  • a transmission medium For example, when a software is transmitted from a website, a server, or some other remote source by using at least one of a wired technology (coaxial cable, optical fiber cable, twisted pair, Digital Subscriber Line (DSL), or the like) and a wireless technology (infrared light, microwave, or the like), then at least one of these wired and wireless technologies is included within the definition of the transmission medium.
  • a wired technology coaxial cable, optical fiber cable, twisted pair, Digital Subscriber Line (DSL), or the like
  • DSL Digital Subscriber Line
  • wireless technology infrared light, microwave, or the like
  • Information, signals, or the like mentioned above may be represented by using any of a variety of different technologies.
  • data, instruction, command, information, signal, bit, symbol, chip, or the like that may be mentioned throughout the above description may be represented by voltage, current, electromagnetic wave, magnetic field or magnetic particle, optical field or photons, or a desired combination thereof.
  • a channel and a symbol may be a signal (signaling) .
  • a signal may be a message.
  • a component carrier CC may be referred to as a carrier frequency, a cell, a frequency carrier, or the like.
  • system and “network” used in the present disclosure can be used interchangeably.
  • the information, the parameter, and the like explained in the present disclosure may be represented by an absolute value, may be expressed as a relative value from a predetermined value, or may be represented by corresponding other information.
  • the radio resource may be indicated by an index.
  • base station BS
  • radio base station fixed station
  • NodeB NodeB
  • eNodeB eNodeB
  • gNodeB gNodeB
  • the base station may also be referred to with the terms such as a macro cell, a small cell, a femtocell, or a pico cell.
  • the base station can accommodate one or more (for example, three) cells (also referred to as sectors). In a configuration in which the base station accommodates a plurality of cells, the entire coverage area of the base station can be divided into a plurality of smaller areas. In each of such a smaller area, communication service can be provided by a base station subsystem (for example, a small base station for indoor use (Remote Radio Head: RRH)).
  • a base station subsystem for example, a small base station for indoor use (Remote Radio Head: RRH)
  • cell refers to a part or all of the coverage area of at least one of a base station and a base station subsystem that performs communication service in this coverage.
  • MS mobile station
  • UE user equipment
  • terminal terminal
  • the mobile station may be called by the persons skilled in the art as a subscriber station, a mobile unit, a subscriber unit, a radio unit, a remote unit, a mobile device, a radio device, a radio communication device, a remote device, a mobile subscriber station, an access terminal, a mobile terminal, a radio terminal, a remote terminal, a handset, a user agent, a mobile client, a client, or with some other suitable term.
  • At least one of a base station and a mobile station may be referred to as a transmitting device, a receiving device, a communication device, or the like.
  • a base station and a mobile station may be a device mounted on a moving body, a moving body itself, or the like.
  • the moving body may be a vehicle (for example, a car, an airplane, or the like), a moving body that moves unmanned (for example, a drone, an automatically driven vehicle, or the like), or a robot (manned type or unmanned type).
  • At least one of a base station and a mobile station can be a device that does not necessarily move during the communication operation.
  • at least one of a base station and a mobile station may be an Internet of Things (IoT) device such as a sensor.
  • IoT Internet of Things
  • a base station in the present disclosure may be read as a mobile station (user terminal, hereinafter the same applies) .
  • each of the aspects/embodiments of the present disclosure may be applied to a configuration that allows communication between a base station and a mobile station to be replaced with communication between a plurality of mobile stations (which, may be referred to as, for example, Device-to-Device (D2D), Vehicle-to-Everything (V2X), or the like).
  • the mobile station may have the function of the base station.
  • Words such as "uplink” and “downlink” may also be replaced with wording corresponding to inter-terminal communication (for example, "side”).
  • terms such as an uplink channel, a downlink channel, or the like may be replaced as a side channel.
  • a mobile station in the present disclosure may be read as a base station.
  • the base station may have the function of the mobile station.
  • connection means any direct or indirect connection or coupling between two or more elements.
  • one or more intermediate elements may be present between two elements that are “connected” or “coupled” to each other.
  • the coupling or connection between the elements may be physical, logical, or a combination thereof.
  • connection may be read as "access”.
  • two elements can be “connected” or “coupled” to each other by using at least one of one or more wires, cables, and printed electrical connections, and as some non-limiting and non-exhaustive examples, by using electromagnetic energy having wavelengths in the radio frequency region, the microwave region, and light (both visible and invisible) region, and the like.
  • the reference signal may be abbreviated as RS and may be referred to as pilot according to applicable standards.
  • the phrase “based on” does not mean “based only on” unless explicitly stated otherwise. In other words, the phrase “based on” means both “based only on” and “based at least on”.
  • any reference to an element using a designation such as “first”, “second”, and the like used in the present disclosure generally does not limit the amount or order of those elements. Such designations can be used in the present disclosure as a convenient way to distinguish between two or more elements. Thus, the reference to the first and second elements does not imply that only two elements can be adopted, or that the first element must precede the second element in some or the other manner.
  • the term "A and B are different” may mean “A and B are different from each other”. Note that the term may mean “A and B are each different from C”. Terms such as “leave”, “coupled”, or the like may also be interpreted in the same manner as “different”.
  • the terminal is useful to recover the beam failure while suppressing the increase in the load on the network in the secondary cell.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
EP19934144.7A 2019-06-21 2019-06-21 Endgerät Withdrawn EP3989628A1 (de)

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US11870536B2 (en) 2024-01-09
JPWO2020255423A1 (de) 2020-12-24

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